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肌肉收縮、肌肉鍛鍊、肌肉大、力氣、肌力
2019-12-14 / 好痛痛再創作

關於肌力這件事,第一篇:微觀

為什麼超級賽亞人力氣很大?
因為他肌肉很大嗎?不,是因為他是超級賽亞人。
LeBron James 為什麼力氣很大?
因為他肌肉很大嗎?對,因為他肌肉很大。

肌肉很大為什麼就很有力氣?
因為肌肉很粗嗎?
不,是因為他肌原纖維比較多條。
就像是….一個人推車推不動,但是三個人可能就推得動。
除非你是老漢,老漢本來就很會推車。

那為什麼健美先生常常不是全世界力氣最大的人呢?
因為認真說肌肉大不代表肌纖維多,有可能是肌肉之間的間質比較多,但間質不會幫助收縮。

肌肉是由很多肌纖維細胞一綑一綑組成的,而肌纖維細胞裡面是由肌節作為單位在收縮。

肌力、肌肉結構、肌纖維、肌絲、肌節、肌肉收縮、肌肉放鬆

而肌節從台北北門站附近可以坐車到林口,再到桃園機場。不對那是機捷,不是肌節。肌節是由肌球蛋白和肌動蛋白組成的。
你的肌肉之所以會收縮,是因為肌球蛋白上面有很多觸手!他在接受到訊號後會把兩邊的肌動蛋白往內拉!

肌肉收縮原理,肌球蛋白拉動肌動蛋白,肌力

平常的時候咧,肌肉是放鬆的,肌球蛋白的觸手沒有對肌動做出奇怪的行為。正確來說是肌動蛋白要被抓住的地方是關起來的。

當大腦發出肌肉收縮的訊號時,訊號會傳到運動神經、再傳到神經的突觸終端、再傳到突觸終端與肌纖維細胞之間的運動終版。
註:如果運動終版出了問題,可能會導致肌肉一直收縮,形成激痛點,詳情見這篇。

肌纖維細胞從運動終版收到訊號後,會叫T小管釋出鈣離子,鈣離子會讓肌動蛋白將被抓住的地方打開!

肌球蛋白:「喔喔喔喔喔!打開了!!!抓啊!!!」
肌動蛋白:「討厭~~~ >//////<」

然後你肌肉就收縮了。

肌肉收縮的力量是從哪裡來的呢?

ATP!ATP 是 Avengers Teats Protecter 復仇者聯盟奶頭保護者的意思。不是,是三磷酸腺苷。你也不要管他怎麼唸或是什麼,總之你身體有三套能量系統,磷化物系統:燒很快的,8~10秒燒乾;乳酸系統,可以用久一點;有氧系統:厲害到陪你跑馬拉松。
這些能量系統可以水解 ATP ,讓肌肉裡面的觸手抓來抓去。

看完這些之後,你就知道怎麼練肌肉了:

  1. 肌纖維要多,觸手要多。
  2. 能量系統要強。
  3. 神經系統要給力。

有了這個概念後,下一篇將介紹如何鍛鍊你的力氣!以及什麼是週期化訓練?

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